I have a 240x480 primary 120x240 secondary single phase transformer that I need to configure to run a 13amp 460v single phase electroarc tap burner on 240 service (to be used very infrequently, primarily to make sure it works properly). Transformer schematic below. To use this as a step up transformer I have my 240 supply running to X1 and X4. x2 and x3 are jumpered together, and tested momentarily I get the proper 460 out from h1 and h2 with taps 5&6 connected. I didn't attach the supply ground for the test. There is a jumper running from x2x3 to the cabinet left over from the previous, conventional step down installation equipment side. My question is should this jumper be removed or left in place? My supply ground will then go to the cabinet together with the ground from the electroarc. If there is supposed to be a jumper from the "center" to ground on the equipment side should there then be a jumper from the 5/6 to ground?